what kind of high pass filter did you buy? are you using the high level connection to connect the REL's? did you corner place the two subs or?Just installed dual 1003’s in my small condo to mate with a Sennheiser Ambeo soundbar: wow! Can’t believe how much bass these small boxes can produce. It’s actually too much (even with the isolation feet I installed from SVS). Got a neighbor complaint even after running the Ambeo calibration from a neighbor (I live in a small condo), and lowering the level. Ordered a high pass 50 HZ filter to tame it down, hope that eliminates the complaints. Really wasn’t expecting this much performance out of these small, relatively inexpensive subs: well done REL!